Lee Hsien Yang accused Prime Minister Lee Hsien Loong, 65, of falsely telling parliament Monday that their father had been open to reconsidering plans to demolish a century-old family bungalow.
The house is at the centre of a political drama that has simmered since the 2015 death of the elder Lee, and which has played out in public with the PM and his siblings exchanging barbs on social media, shocking a tightly controlled nation unused to divisions among the elite.
But the prime minister's siblings say their brother is attempting to block the house's demolition to capitalise on their father's legacy for his own political agenda, including grooming his own son as a future leader.
"(Lee Hsien Loong) has made convoluted, but ultimately false, claims about Lee Kuan Yew's wishes," the 60-year-old said in a Facebook post Tuesday, which was shared by his sister Wei Ling, 62.
The dispute burst into the open last month when the PM's brother and sister launched attacks on Facebook, which quickly went viral.
However Hsien Yang said that his father had been misled by the prime minister into agreeing to the renovation, with the elder Lee made to believe the house had been listed as a national monument so could not be torn down -- a claim of which the founding leader's lawyer had found no evidence.
Lee Kuan Yew, the country's authoritarian first prime minister, ruled Singapore from 1959 to 1990.
The debate in parliament continued for a second day on Tuesday.
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